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From 7195eb3dcc15a2a0ea8c557806abf32241e276d1 Mon Sep 17 00:00:00 2001
From: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Date: Wed, 13 Jun 2012 21:28:09 +0530
Subject: [PATCH 23/46] ath9k: Fix softlockup in AR9485
commit bcb7ad7bcbef030e6ba71ede1f9866368aca7c99 upstream.
steps to recreate:
load latest ath9k driver with AR9485
stop the network-manager and wpa_supplicant
bring the interface up
Call Trace:
[<ffffffffa0517490>] ? ath_hw_check+0xe0/0xe0 [ath9k]
[<ffffffff812cd1e8>] __const_udelay+0x28/0x30
[<ffffffffa03bae7a>] ar9003_get_pll_sqsum_dvc+0x4a/0x80 [ath9k_hw]
[<ffffffffa05174eb>] ath_hw_pll_work+0x5b/0xe0 [ath9k]
[<ffffffff810744fe>] process_one_work+0x11e/0x470
[<ffffffff8107530f>] worker_thread+0x15f/0x360
[<ffffffff810751b0>] ? manage_workers+0x230/0x230
[<ffffffff81079af3>] kthread+0x93/0xa0
[<ffffffff815fd3a4>] kernel_thread_helper+0x4/0x10
[<ffffffff81079a60>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff815fd3a0>] ? gs_change+0x13/0x13
ensure that the PLL-WAR for AR9485/AR9340 is executed only if the STA is
associated (or) IBSS/AP mode had started beaconing. Ideally this WAR
is needed to recover from some rare beacon stuck during stress testing.
Before the STA is associated/IBSS had started beaconing, PLL4(0x1618c)
always seem to have zero even though we had configured PLL3(0x16188) to
query about PLL's locking status. When we keep on polling infinitely PLL4's
8th bit(ie check for PLL locking measurements is done), machine hangs
due to softlockup.
fixes https://bugzilla.redhat.com/show_bug.cgi?id=811142
Reported-by: Rolf Offermanns <rolf.offermanns@gmx.net>
Tested-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/net/wireless/ath/ath9k/main.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 5b22ecd..95437fc 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1042,6 +1042,15 @@ void ath_hw_pll_work(struct work_struct *work)
hw_pll_work.work);
u32 pll_sqsum;
+ /*
+ * ensure that the PLL WAR is executed only
+ * after the STA is associated (or) if the
+ * beaconing had started in interfaces that
+ * uses beacons.
+ */
+ if (!(sc->sc_flags & SC_OP_BEACONS))
+ return;
+
if (AR_SREV_9485(sc->sc_ah)) {
ath9k_ps_wakeup(sc);
--
1.7.10
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